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With PR33517, it became apparent that symbol table creation can fail
when presented with malformed inputs. This patch makes that sort of
error detectable, so llvm-cov etc. can fail more gracefully.
Specifically, we now check that function names within the symbol table
aren't empty.
Testing: check-{llvm,clang,profile}, some unit test updates.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305765 91177308-0d34-0410-b5e6-96231b3b80d8